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BELIEVERpriest
There are a number of ways that the Rhesus factor can manifest in a person: -/-, -/+, +/+, +/-. If their was a connection between rh negativity and the absence of this wrist muscle, I would expect it to be most prevalent in rh -/- people. That is the rares combination.
Corpsehoagie
reply to post by VoidFire
You're either seeing the palmaris longus and another tendon or two other tendons and no palmaris longus, depending on their alignment. Thanks for the comments